CN218768477U

CN218768477U - Projection device

Info

Publication number: CN218768477U
Application number: CN202221819101.8U
Authority: CN
Inventors: 元永明
Original assignee: Guangzhou Shiyuan Electronics Thecnology Co Ltd; Guangzhou Shirui Electronics Co Ltd
Current assignee: Guangzhou Shiyuan Electronics Thecnology Co Ltd; Guangzhou Shirui Electronics Co Ltd
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2023-03-28
Anticipated expiration: 2032-07-14

Abstract

The application discloses projection arrangement, including base, projection subassembly, bluetooth module and controller. The projection assembly is used for projecting a writing grid pattern. The projection assembly is mounted on the base and used for projecting the writing lattice pattern to the first plane. The Bluetooth module can be positioned in the base and is used for establishing Bluetooth connection with the user terminal so as to receive an operation instruction sent by the user terminal. The controller is electrically connected with the Bluetooth module and the projection assembly and used for controlling the projection assembly to project a corresponding writing lattice pattern to the first plane according to the operation instruction received by the Bluetooth module. The design solves the problems that the teacher needs to change the paster or hand-drawing writing grids during class and the like and delays time.

Description

Projection device

Technical Field

The application relates to the technical field of projection, in particular to a projection device.

Background

In order to teach students more normatively, the teacher generally uses writing grids to assist in giving lessons, and for example, in the related art, a magnetic patch printed with a writing grid pattern is attached to a blackboard to write on the patch. However, the patterns used by teachers in different subjects are not the same, and thus, the replacement of the patch having different patterns is required, which is troublesome and time-consuming.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a projection device, and solves the problems that a teacher needs to replace a patch or a handwriting grid during class and the like, and time is delayed.

The embodiment of the application provides a projection device, includes:

a base;

the projection assembly is arranged on the base and used for projecting a writing lattice pattern to a first plane;

the Bluetooth module is positioned in the base and used for establishing Bluetooth connection with a user terminal so as to receive an operation instruction sent by the user terminal; and

and the controller is electrically connected with the Bluetooth module and the projection assembly and is used for controlling the projection assembly to project a writing lattice pattern corresponding to the operation instruction to the first plane according to the operation instruction received by the Bluetooth module.

The beneficial effects of the embodiment of the application are as follows: through setting up bluetooth module, the user can connect bluetooth control projection arrangement through user terminal according to the demand and throw different lattice patterns of writing, writes the lattice pattern after finishing using and need not to clean, the user through user terminal control projection arrangement stop throw write lattice pattern can, save time and environmental protection more, effectively improved user's work efficiency, it is more intelligent convenient. Meanwhile, the projection device is simple and practical in structure and beneficial to mass production and popularization.

In some of these embodiments, the projection assembly comprises:

the controller is used for controlling at least part of the light sources to be lightened according to the operation instructions received by the Bluetooth module so as to project the writing lattice patterns corresponding to the operation instructions.

Based on above-mentioned embodiment, with the projection subassembly design for including a plurality of light sources, the controller can throw out different writing check patterns through the light source of lightening different regions, and the principle is simple and easily realize, and the component structure of projection subassembly is simple and easy simultaneously, and the subsequent maintenance of being convenient for overhauls.

In some of these embodiments, the projection assembly comprises:

at least one light source electrically connected to the controller;

the light shielding sheets are provided with different light transmitting patterns;

the mounting rack is provided with a plurality of types of shading sheets;

first driving piece, the mounting bracket install in on the first driving piece, the controller with first driving piece electric connection is used for the basis bluetooth module is received operating instruction control first driving piece drives the mounting bracket motion, so that with operating instruction corresponds the anti-dazzling screen is located the light-emitting side of light source makes light that the light source sent passes can be in behind the printing opacity pattern on the anti-dazzling screen first plane formation corresponds write check pattern.

Based on the embodiment, the light-shielding sheets with different light-transmitting patterns are arranged, so that the light-shielding sheets corresponding to the operation instructions of the user are positioned in front of the light source to project the corresponding writing lattice patterns, the number of the light sources can be reduced, more electricity is saved, and the use cost of the projection device is reduced.

In some of these embodiments, further comprising:

the lamp shade, the lamp shade install in the base, the projection subassembly install in the lamp shade.

Based on above-mentioned embodiment, through setting up the lamp shade, the projection subassembly is installed in the lamp shade, and the lamp shade provides independent and comparatively confined operational environment for the projection subassembly, can effectively protect the projection subassembly, prevents that impurity such as dust or liquid from getting into the projection subassembly and causing the damage to it, can prolong the life of projection subassembly.

In some embodiments, the lamp cover is elongated, and the lamp cover has a light-transmitting region extending along a length direction thereof, and the light-transmitting region is located on a light-emitting side of the projection assembly.

Based on above-mentioned embodiment, set up the lamp shade into including the printing opacity district, the light that has restricted projection subassembly to throw only jets out from the printing opacity district, can prevent that light from throwing elsewhere and causing the light pollution, perhaps light penetrates user's eyes directly and causes the injury, has improved projection arrangement's security performance. The light-transmitting area is arranged to extend along the length direction of the lampshade, so that the projection area of the projection assembly can be increased.

In some of these embodiments, the base comprises:

the lampshade is arranged on the main body, and the Bluetooth module is positioned in the main body;

the mounting panel, the mounting panel is located the main part is kept away from one side of lamp shade, the one end of mounting panel is connected the main part, the other end is towards keeping away from the main part just follows the length direction of lamp shade extends, the mounting panel is used for being fixed in first plane.

Based on above-mentioned embodiment, through setting up the main part, bluetooth module can effectively be protected in being located the main part to bluetooth module. The mounting panel extends along the length direction of lamp shade, can increase the area of being connected of mounting panel and first plane, makes more firm the connecting in first plane of mounting panel, and then projection subassembly also can be more stable throw write check pattern.

In some embodiments, the mounting plate has a mounting hole, and the projection apparatus further includes:

the mounting, including tip and pole portion, the tip is located the mounting panel is close to one side of main part, pole portion passes the mounting hole just is used for being fixed in first plane.

Based on the embodiment, the screw connection mode has the advantages of simple structure, reliable edge connection and convenient assembly and disassembly.

In some of these embodiments, further comprising:

the mounting seat is used for being mounted on the first plane, the mounting seat is provided with a first surface attached to the first plane, a second surface back to the first surface and a top surface connected between the first surface and the second surface, the top surface is provided with a first accommodating groove, the second surface is provided with a second accommodating groove, the second accommodating groove is communicated with the first accommodating groove and penetrates through the top surface, the mounting plate is located in the first accommodating groove, and the main body penetrates through the second accommodating groove.

Based on above-mentioned embodiment, through setting up the mount pad, the mount pad can paste and locate first plane, need not to install with the help of the foreign object, and the installation is convenient swift. Simultaneously, the mount pad is provided with first holding tank and second holding tank, and first holding tank and second holding tank can be worn to locate respectively by mounting panel and main part, and connection structure is simple and easy, and the user of being convenient for assembles or dismantles mount pad and base by oneself.

In some embodiments, the main body has a third surface, the third surface is recessed inwards to form a mounting region, the mounting region extends along the length direction of the lampshade, and the lampshade is arranged in the mounting region in a penetrating mode.

Based on above-mentioned embodiment, with the main part design for having the installation interval, the lamp shade wears to locate the installation interval in, the equipment and the dismantlement of lamp shade and main part of being convenient for, the lamp shade can directly take out the maintenance, the easy access maintenance in the installation interval with the lamp shade when the lamp shade goes wrong simultaneously.

In some embodiments, the third surface is recessed inward and forms an inlet communicated with the mounting region, the inlet extends along a length direction of the lampshade, and a caliber of the inlet is smaller than an outer diameter of the lampshade along a direction perpendicular to the length direction of the lampshade.

Based on above-mentioned embodiment, through setting up the entry, the lamp shade can be followed the entry and got into the installation interval, has increased the loading and unloading mode of lamp shade and main part, and the bore of entry is less than the external diameter of lamp shade and is used for preventing that the lamp shade from falling from the installation interval in.

In some of these embodiments, the writing grid pattern comprises at least one of a field grid pattern, a rice grid pattern, a pinyin four-line grid pattern, a staff pattern, and an array dot grid pattern; and/or

The projection assembly is used for emitting laser; and/or

The first plane is a blackboard surface or a wall surface.

Based on above-mentioned embodiment, with the light source design of projection subassembly for laser, more pure light can be launched to the laser, does not have the interference of mixed and disorderly light, makes to throw and writes the grid pattern more clear, and laser source's life is longer, and stability is stronger.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic perspective view of a first projection apparatus provided in an embodiment of the present application;

FIG. 2 is an enlarged schematic view of the projection apparatus shown in FIG. 1 at A;

FIG. 3 is a connection block diagram of a Bluetooth module, a controller and a projection assembly of the projection apparatus shown in FIG. 1;

fig. 4 is a schematic view illustrating operating states of a plurality of light sources in a projection assembly of a second projection apparatus according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a projection module in a third projection apparatus according to an embodiment of the present disclosure;

FIG. 6 is a schematic perspective view of a base of the projection apparatus shown in FIG. 1;

FIG. 7 is a perspective view of the base shown in FIG. 6 from another perspective;

FIG. 8 is an exploded view of the base and the mount of the projection apparatus shown in FIG. 1;

FIG. 9 is a schematic perspective assembly of the base and the fixing member shown in FIG. 8;

fig. 10 is a schematic perspective view of an assembled structure of a base and a mounting base in a fourth projection apparatus according to an embodiment of the present disclosure;

fig. 11 is a perspective view of the mounting base shown in fig. 9.

Reference numerals are as follows: 100. a projection device; a. a first plane; 110. a base; 111. a main body; 1111. a third surface; d. installing an interval; e. an inlet; 112. mounting a plate; 1121. mounting holes; 120. a projection assembly; 121. a light source; 122. a shading sheet; 123. a mounting frame; 130. a lamp shade; 131. a light-transmitting region; 140. a fixing member; 141. an end portion; 142. a rod portion; 150. a mounting seat; 151. a first surface; 152. a second surface; c. a second accommodating groove; 153. a top surface; b. a first accommodating groove; 160. a Bluetooth module; 170. and a controller.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In order to teach students more normatively to write, teachers generally use writing grids to assist in teaching, for example, in the related art, a magnetic patch printed with a writing grid pattern is attached to a blackboard to write on the patch. However, the patterns of the writing grids used by teachers of different subjects are different, so that the patches with different patterns of the writing grids need to be replaced, the operation is troublesome and the time is delayed. The embodiment of the application provides a projection device, and aims to solve the problems.

Referring to fig. 1 and 3, an embodiment of the present application provides a projection apparatus 100, and the projection apparatus 100 may include a base 110, a projection assembly 120, a bluetooth module 160, and a controller 170. The projection assembly 120 is used to project a writing grid pattern.

Referring to fig. 1, the projection assembly 120 is mounted on the base 110 for projecting a writing lattice pattern to the first plane a. The bluetooth module 160 may be located in the base 110, and the bluetooth module 160 is configured to establish a bluetooth connection with the user terminal to receive an operation instruction sent by the user terminal. The controller 170 is electrically connected to the bluetooth module 160 and the projection component 120, and is configured to control the projection component 120 to project a corresponding writing lattice pattern to the first plane a according to an operation instruction received by the bluetooth module 160.

When the operating instructions received by the bluetooth module 160 are different, the controller 170 controls the writing lattice patterns projected by the projection component 120 to be changed, so that the writing lattice patterns on the first plane a can be flexibly adjusted according to the user requirements.

Specifically, a mapping relationship may be established between different types of operation instructions that may be received by the bluetooth module 160 and different types of writing lattice patterns that may be projected by the projection assembly 120, so that after the bluetooth module 160 receives one type of operation instruction, the controller 170 may control the projection assembly 120 to project a writing lattice pattern corresponding to the operation instruction. For example, the different operation instructions that the bluetooth module 160 may receive include a first operation instruction, a second operation instruction, a third operation instruction, a fourth operation instruction, a fifth operation instruction, and the like, and the plurality of writing grid patterns that the projection component 120 may project include a field grid pattern, a mi grid pattern, a pinyin four-line grid pattern, a staff pattern, an array dot grid pattern, and the like, where the first operation instruction may be associated with the field grid pattern, the second operation instruction may be associated with the mi grid pattern, and the like, so that when a user issues the first operation instruction through the user terminal, the controller 170 may control the projection component 120 to project the field grid pattern.

It should be noted that, the controller 170 controls another device to generate an operation corresponding to an operation instruction according to the operation instruction received by the other device, which is disclosed in the related art, and the detailed description of the embodiment of the present application is omitted here. The embodiment of the application focuses on applying the scheme to the technical field of projection, so that different writing lattice patterns can be projected on the first plane according to the requirements of users. Writing the check pattern after finishing using need not to clean for projection arrangement 100 stop throw write check pattern can, save time and environmental protection more, effectively improved user's work efficiency, it is more intelligent convenient. Meanwhile, the projection device 100 has a simple and practical structure, and is beneficial to mass production and popularization.

The projection apparatus 100 may be provided with a shutdown key, and a user may operate the shutdown key to turn off the projection apparatus 100, or may control the projection apparatus 100 to turn off through a user terminal.

In some embodiments, referring to fig. 1 to fig. 2, the projection assembly 120 may include a plurality of light sources 121, the plurality of light sources 121 are distributed in an array and electrically connected to the controller 170, and the controller 170 is configured to control at least a portion of the light sources 121 to be turned on according to an operation instruction received by the bluetooth module 160, so as to project a writing lattice pattern corresponding to the operation instruction. The projection assembly 120 is designed to include a plurality of light sources 121, and the controller 170 can project different writing grid patterns by lighting the light sources 121 in different areas, so that the principle is simple and easy to implement, and meanwhile, the projection assembly 120 is simple in structure and convenient for subsequent maintenance and repair.

The controller 170 may store mapping relationships between a plurality of writing grid patterns and a plurality of light sources 121 in advance. For example, with reference to fig. 4, when the projection assembly 120 includes 5 × 5 light sources 121, the lighting conditions of the light sources 121 in the projection assembly 120 corresponding to the checkered patterns in the multiple writing lattices are: all of the first, third, and fifth row light sources 121 are turned on and all of the first, third, and fifth column light sources 121 are turned on; it should be noted that, the writing lattice pattern here is only exemplified by one field lattice pattern, of course, the writing lattice pattern may be a plurality of field lattice patterns arranged in an array, and the like, and the projection component 120 may project a plurality of field lattice patterns on the first plane a at the same time, which is not described in detail in this embodiment of the application.

In other embodiments, referring to fig. 5, the projection assembly 120 may include at least one light source 121, various light-shielding sheets 122, a mounting frame 123 and a first driving member. The light source 121 is electrically connected to the controller 170. Each light-shielding sheet 122 may have different light-transmitting patterns, and the plurality of light-shielding sheets 122 are all mounted on the mounting frame 123. The mounting frame 123 is installed on the first driving member, and the controller 170 is electrically connected to the first driving member, and is configured to control the first driving member to drive the mounting frame 123 to move according to the operation instruction received by the bluetooth module 160, so that the corresponding light shielding sheet 122 is located on the light emitting side of the light source 121, and the light emitted by the light source 121 can form a corresponding writing lattice pattern on the first plane a after passing through the light-transmitting pattern on the light shielding sheet 122. By arranging the multiple light-shielding sheets 122 with different light-transmitting patterns, the light-shielding sheets 122 corresponding to the operation instruction of the user are positioned in front of the light sources 121, so that the corresponding writing lattice patterns can be projected, the number of the light sources 121 can be reduced, more electricity can be saved, and the use cost of the projection device 100 can be reduced.

Referring to fig. 1 to 2, the projection apparatus 100 may further include a lamp cover 130, the lamp cover 130 may be mounted on the base 110, and the projection assembly 120 may be mounted in the lamp cover 130. Through setting up lamp shade 130, projection subassembly 120 installs in lamp shade 130, and lamp shade 130 provides independent and comparatively confined operational environment for projection subassembly 120, can effectively protect projection subassembly 120, prevents that impurity such as dust or liquid from getting into projection subassembly 120 and causing the damage to it, can prolong projection subassembly 120's life.

Further, referring to fig. 1 to 2, the lamp cover 130 may be elongated, the lamp cover 130 has a light-transmitting region 131 extending along a length direction thereof, and the light-transmitting region 131 is located at a light-emitting side of the projection assembly 120. The lampshade 130 is set to include the light-transmitting area 131, so that the light projected by the projection assembly 120 is limited to be emitted to the first plane a only from the light-transmitting area 131, and the light can be prevented from being projected to other places to cause light pollution or being projected to eyes of a user to cause injury, and the safety performance of the projection device 100 is improved. The light-transmitting region 131 is disposed to extend along the length of the lamp housing 130, so that the projection area of the projection module 120 can be increased.

Referring to fig. 6 and 7, the base 110 may include a main body 111 and a mounting plate 112. The lampshade 130 can be installed on the main body 111, and the Bluetooth module 160 can be located in the main body 111, so that the Bluetooth module 160 can be effectively protected. The mounting plate 112 is located the main part 111 and keeps away from one side of lamp shade 130, and the main part 111 is connected to the one end of mounting plate 112, and the other end is towards keeping away from main part 111 and extending along the length direction of lamp shade 130, can increase the area of being connected of mounting plate 112 and first plane a, makes the more firm connection of mounting plate 112 be fixed in first plane a, and then projection unit 120 also can be more stable the projection write check pattern.

In some embodiments, referring to fig. 1 and 8, the mounting plate 112 may have mounting holes 1121. The projection apparatus 100 may further include a fixing member 140, the fixing member 140 may include an end portion 141 and a rod portion 142, please refer to fig. 9 (fig. 9 shows that the fixing member 140 is installed in the installation hole 1121), the end portion 141 is located at a side of the installation plate 112 close to the main body 111, and the rod portion 142 passes through the installation hole 1121 and is used for being fixed to the first plane a. The screw connection mode has the advantages of simple structure, reliable connection and convenient assembly and disassembly. It is understood that the rod portion 142 may have a thread structure, so that the rod portion 142 is more firmly fixed to the first plane a.

Further, the main body 111 and the mounting plate 112 may be at least one of plastic or metal. The plastic material is light and cheap; the metal material has higher strength and is durable. Further, the main body 111 and the mounting plate 112 may be integrally formed.

In other embodiments, referring to fig. 1, 10 and 11, the projection apparatus 100 may further include a mounting base 150. The mounting base 150 is configured to be mounted on a first plane a, the mounting base 150 has a first surface 151 attached to the first plane a, a second surface 152 opposite to the first surface 151, and a top surface 153 connected between the first surface 151 and the second surface 152, the top surface 153 has a first receiving groove b, the second surface 152 has a second receiving groove c, the second receiving groove c is communicated with the first receiving groove b and penetrates through to the top surface 153, the mounting plate 112 is located in the first receiving groove b, and the main body 111 penetrates through the second receiving groove c. Through setting up mount pad 150, mount pad 150 can paste and locate first plane a, need not to install with the help of the foreign object, and the installation is convenient swift. Meanwhile, the mounting seat 150 is provided with a first receiving groove b and a second receiving groove c, the mounting plate 112 and the main body 111 can be respectively arranged in the first receiving groove b and the second receiving groove c in a penetrating manner, the connecting structure is simple, and a user can conveniently assemble or disassemble the mounting seat 150 and the base 110 by himself/herself.

It is understood that, referring to fig. 1 and 6, the main body 111 may have a third surface 1111, and the third surface 1111 is recessed inward to form a mounting interval d, wherein "recessed inward" means that the third surface 1111 is recessed toward an inner direction close to the main body 111. The installation section d extends along the length direction of the lamp cover 130, and the lamp cover 130 is disposed through the installation section d. The design is convenient for the equipment and the dismantlement of lamp shade 130 and main part 111 portion like this, and lamp shade 130 can directly be taken out the maintenance in the interval d of installation with lamp shade 130 when the lamp shade 130 goes wrong simultaneously, and the easy access is maintained.

Optionally, the projection component 120 may project a writing lattice pattern in a large area, the bluetooth module 160 may receive an area control instruction sent by the user terminal, and when the bluetooth module 160 receives different area control instructions, the controller 170 controls the projection component 120 to project the writing lattice pattern to an area position of the first plane a, so that the user may control to project the writing lattice pattern in a full area, or project the writing lattice pattern only in a certain area, so that the projection component 120 can more fully meet the user requirement.

For example, the cover 130 may rotate around a first axis in the installation section d, the first axis may extend along the length direction of the cover 130, so that the light-transmitting area 131 on the cover 130 is adjustable relative to the first plane a, and the writing lattice pattern projected through the light-transmitting area 131 may be located at different positions on the first plane a. Optionally, the projection apparatus 100 may further include a second driving member for driving the lamp housing 130 to rotate around the first axis. Alternatively, the lampshade 130 may rotate around the first axis to make the transparent area 131 face to different areas of the first plane a, so that after the user uses the writing lattice at one area, the projection assembly 120 may project the writing lattice to another area through the transparent area 131 on the lampshade 130, and so on, to improve the writing progress.

Further, referring to fig. 1 and 7, the third surface 1111 may be recessed inward and form an inlet e communicating with the mounting region d, the inlet e extends along a length direction of the lamp cover 130, and a caliber of the inlet e is smaller than an outer diameter of the lamp cover 130 along a direction perpendicular to the length direction of the lamp cover 130. By providing the entrance e, the globe 130 can enter the installation section d from the entrance e, so that the attachment/detachment manner of the globe 130 to the main body 111 is increased, and the diameter of the entrance e is smaller than the outer diameter of the globe 130 to prevent the globe 130 from falling from the installation section d.

It will be appreciated that the writing grid pattern may include at least one of a field grid pattern, a rice grid pattern, a pinyin four-line grid pattern, a staff pattern, and an array dot grid pattern. The first plane a may be a blackboard surface or a wall surface. Projection subassembly 120 can be used for sending laser, and more pure light can be launched to the laser, does not have the interference of mixed and disorderly light, makes to throw and writes the grid pattern more clear, and laser light source 121's life is longer, and stability is stronger.

The specific operation process is as follows: firstly, a user can establish bluetooth connection with a bluetooth device of the projection apparatus 100 through a terminal device such as a mobile phone, and then the user can send different types of operation instructions to the projection apparatus 100 through the mobile phone, the controller 170 will control the projection module to project a corresponding writing grid pattern after receiving the operation instructions, and after the use is finished, the user can cut off the bluetooth connection with the projection apparatus 100.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it is to be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the above terms may be understood by those skilled in the art according to specific situations.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A projection device, comprising:

a base;

2. The projection device of claim 1, wherein the projection assembly comprises:

3. The projection device of claim 1, wherein the projection assembly comprises:

at least one light source electrically connected to the controller;

the multiple types of shading sheets are arranged on the mounting rack;

the first driving piece, the mounting bracket install in on the first driving piece, the controller with first driving piece electric connection for according to bluetooth module received operating instruction control first driving piece drives the mounting bracket motion, so that with operating instruction corresponds the light-shielding piece is located the light-emitting side of light source makes light that the light source sent passes can be in behind the printing opacity pattern on the light-shielding piece first plane formation corresponds write check pattern.

4. The projection device of claim 1, further comprising:

5. The projection device of claim 4, wherein the lamp housing is elongated, the lamp housing having a light transmissive region extending along a length of the lamp housing, the light transmissive region being located on a light exit side of the projection assembly.

6. The projection device of claim 4, wherein the base comprises:

7. The projection device of claim 6, wherein the mounting plate has mounting holes, the projection device further comprising:

8. The projection device of claim 6, further comprising:

9. The projection apparatus as claimed in claim 6, wherein the main body has a third surface, the third surface being recessed inwardly to form a mounting region, the mounting region extending along a length direction of the lamp cover, the lamp cover being disposed through the mounting region.

10. The projection apparatus of claim 9, wherein the third surface is recessed inward and forms an inlet in communication with the mounting region, the inlet extending along a length of the lamp housing, the inlet having a smaller diameter than an outer diameter of the lamp housing in a direction perpendicular to the length of the lamp housing.

11. The projection device of claim 1, wherein the projection assembly is configured to emit laser light; and/or

The first plane is a blackboard surface or a wall surface.